title: Effectiveness of modified C-reactive protein in the modulation of platelet function under different experimental conditions.
abstract: In relation to the interplay between C-reactive protein (CRP) and its various ligands, including extracellular matrix proteins or plasma proteins, herein we compared the effectiveness of modified CRP (mCRP) in modulation of platelet function under different experimental conditions. mCRP (100 μg/ml) was significantly more effective in stimulation of platelet activation when measured in suspensions of isolated platelets than in whole blood (fraction of CD62-positive platelets was 73.4 ± 5.3 vs. 0.8 ± 1.0% in isolated platelets and 7.0 ± 1.8 vs. 1.3 ± 0.4% in whole blood). Platelet adhesion to fibrinogen was almost seven-fold higher in suspensions of isolated platelets compared to platelet-rich plasma (PRP) (P < 0.005). Furthermore, mCRP enhanced platelet aggregation in a whole blood but it had no effect in PRP. The effectiveness of mCRP in stimulation of platelet response in plasma has been associated with the proportions of gamma globulin and albumin in human serum (rp = 0.78, P < 0.0001 for gamma globulin and Rp = -0.52, P = 0.02 for albumin concentrations; for albumin/gamma globulin ratio rp = -0.72, P < 0.0005). Such associations have been further confirmed by experiments showing that mCRP interacts with some immunoglobulins. Taken together, the modulation of platelet function by mCRP seems to be strongly determined by the presence of the gamma globulin fraction in platelet milieu.
authors.affiliation: Department of Haemostasis and Haemostatic Disorders, Medical University of Lodz, University Hospital No. 2, 113 Zeromskiego Street, Lodz, Poland. magdalena.boncler@umed.lodz.pl
authors.forename: Magdalena
authors.initials: M
authors.lastname: Boncler
authors.forename: Joanna
authors.initials: J
authors.lastname: Rywaniak
authors.forename: Paulina
authors.initials: P
authors.lastname: Sicinska
authors.forename: Cezary
authors.initials: C
authors.lastname: Watala
mesh_terms: D001792:Blood Platelets / Q000166:cytology / Q000187:drug effects*; D002097:C-Reactive Protein / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology*; D002478:Cells, Cultured; D003001:Cloning, Molecular; D004926:Escherichia coli; D005340:Fibrinogen / Q000378:metabolism; D005434:Flow Cytometry; D006801:Humans; D009391:Nephelometry and Turbidimetry; D015539:Platelet Activation / Q000187:drug effects*; D010973:Platelet Adhesiveness / Q000187:drug effects*; D010974:Platelet Aggregation / Q000187:drug effects*; D010976:Platelet Count; D053657:Platelet-Rich Plasma / Q000378:metabolism; D011485:Protein Binding; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology*; D012709:Serum Albumin / Q000378:metabolism; D013535:Suspensions; D005719:gamma-Globulins / Q000378:metabolism*
chemical_list: D011994:Recombinant Proteins; D012709:Serum Albumin; D013535:Suspensions; D005719:gamma-Globulins; D005340:Fibrinogen; D002097:C-Reactive Protein